![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
So that we can reuse things like the id to attr lookup routine (perf_evlist__id2evsel) that uses a hash table instead of the linear lookup done in the older perf_header_attr routines, etc. Also to make evsels/evlist more pervasive an API, simplyfing using the emerging perf lib. cc: Arun Sharma <arun@sharma-home.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1137 lines
30 KiB
C
1137 lines
30 KiB
C
#define _FILE_OFFSET_BITS 64
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#include <linux/kernel.h>
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#include <byteswap.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include "evlist.h"
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#include "evsel.h"
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#include "session.h"
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#include "sort.h"
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#include "util.h"
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static int perf_session__open(struct perf_session *self, bool force)
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{
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struct stat input_stat;
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if (!strcmp(self->filename, "-")) {
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self->fd_pipe = true;
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self->fd = STDIN_FILENO;
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if (perf_session__read_header(self, self->fd) < 0)
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pr_err("incompatible file format");
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return 0;
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}
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self->fd = open(self->filename, O_RDONLY);
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if (self->fd < 0) {
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int err = errno;
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pr_err("failed to open %s: %s", self->filename, strerror(err));
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if (err == ENOENT && !strcmp(self->filename, "perf.data"))
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pr_err(" (try 'perf record' first)");
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pr_err("\n");
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return -errno;
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}
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if (fstat(self->fd, &input_stat) < 0)
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goto out_close;
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if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
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pr_err("file %s not owned by current user or root\n",
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self->filename);
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goto out_close;
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}
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if (!input_stat.st_size) {
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pr_info("zero-sized file (%s), nothing to do!\n",
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self->filename);
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goto out_close;
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}
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if (perf_session__read_header(self, self->fd) < 0) {
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pr_err("incompatible file format");
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goto out_close;
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}
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self->size = input_stat.st_size;
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return 0;
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out_close:
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close(self->fd);
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self->fd = -1;
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return -1;
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}
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static void perf_session__id_header_size(struct perf_session *session)
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{
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struct perf_sample *data;
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u64 sample_type = session->sample_type;
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u16 size = 0;
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if (!session->sample_id_all)
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goto out;
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if (sample_type & PERF_SAMPLE_TID)
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size += sizeof(data->tid) * 2;
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if (sample_type & PERF_SAMPLE_TIME)
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size += sizeof(data->time);
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if (sample_type & PERF_SAMPLE_ID)
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size += sizeof(data->id);
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if (sample_type & PERF_SAMPLE_STREAM_ID)
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size += sizeof(data->stream_id);
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if (sample_type & PERF_SAMPLE_CPU)
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size += sizeof(data->cpu) * 2;
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out:
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session->id_hdr_size = size;
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}
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void perf_session__update_sample_type(struct perf_session *self)
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{
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self->sample_type = perf_evlist__sample_type(self->evlist);
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self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
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perf_session__id_header_size(self);
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}
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int perf_session__create_kernel_maps(struct perf_session *self)
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{
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int ret = machine__create_kernel_maps(&self->host_machine);
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if (ret >= 0)
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ret = machines__create_guest_kernel_maps(&self->machines);
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return ret;
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}
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static void perf_session__destroy_kernel_maps(struct perf_session *self)
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{
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machine__destroy_kernel_maps(&self->host_machine);
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machines__destroy_guest_kernel_maps(&self->machines);
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}
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struct perf_session *perf_session__new(const char *filename, int mode,
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bool force, bool repipe,
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struct perf_event_ops *ops)
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{
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size_t len = filename ? strlen(filename) + 1 : 0;
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struct perf_session *self = zalloc(sizeof(*self) + len);
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if (self == NULL)
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goto out;
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memcpy(self->filename, filename, len);
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self->threads = RB_ROOT;
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INIT_LIST_HEAD(&self->dead_threads);
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self->last_match = NULL;
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/*
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* On 64bit we can mmap the data file in one go. No need for tiny mmap
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* slices. On 32bit we use 32MB.
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*/
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#if BITS_PER_LONG == 64
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self->mmap_window = ULLONG_MAX;
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#else
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self->mmap_window = 32 * 1024 * 1024ULL;
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#endif
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self->machines = RB_ROOT;
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self->repipe = repipe;
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INIT_LIST_HEAD(&self->ordered_samples.samples);
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INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
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INIT_LIST_HEAD(&self->ordered_samples.to_free);
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machine__init(&self->host_machine, "", HOST_KERNEL_ID);
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if (mode == O_RDONLY) {
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if (perf_session__open(self, force) < 0)
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goto out_delete;
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perf_session__update_sample_type(self);
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} else if (mode == O_WRONLY) {
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/*
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* In O_RDONLY mode this will be performed when reading the
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* kernel MMAP event, in perf_event__process_mmap().
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*/
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if (perf_session__create_kernel_maps(self) < 0)
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goto out_delete;
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}
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if (ops && ops->ordering_requires_timestamps &&
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ops->ordered_samples && !self->sample_id_all) {
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dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
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ops->ordered_samples = false;
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}
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out:
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return self;
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out_delete:
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perf_session__delete(self);
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return NULL;
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}
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static void perf_session__delete_dead_threads(struct perf_session *self)
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{
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struct thread *n, *t;
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list_for_each_entry_safe(t, n, &self->dead_threads, node) {
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list_del(&t->node);
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thread__delete(t);
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}
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}
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static void perf_session__delete_threads(struct perf_session *self)
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{
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struct rb_node *nd = rb_first(&self->threads);
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while (nd) {
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struct thread *t = rb_entry(nd, struct thread, rb_node);
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rb_erase(&t->rb_node, &self->threads);
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nd = rb_next(nd);
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thread__delete(t);
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}
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}
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void perf_session__delete(struct perf_session *self)
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{
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perf_session__destroy_kernel_maps(self);
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perf_session__delete_dead_threads(self);
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perf_session__delete_threads(self);
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machine__exit(&self->host_machine);
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close(self->fd);
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free(self);
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}
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void perf_session__remove_thread(struct perf_session *self, struct thread *th)
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{
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self->last_match = NULL;
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rb_erase(&th->rb_node, &self->threads);
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/*
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* We may have references to this thread, for instance in some hist_entry
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* instances, so just move them to a separate list.
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*/
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list_add_tail(&th->node, &self->dead_threads);
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}
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static bool symbol__match_parent_regex(struct symbol *sym)
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{
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if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
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return 1;
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return 0;
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}
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int perf_session__resolve_callchain(struct perf_session *self,
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struct thread *thread,
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struct ip_callchain *chain,
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struct symbol **parent)
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{
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u8 cpumode = PERF_RECORD_MISC_USER;
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unsigned int i;
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int err;
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callchain_cursor_reset(&self->callchain_cursor);
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for (i = 0; i < chain->nr; i++) {
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u64 ip = chain->ips[i];
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struct addr_location al;
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if (ip >= PERF_CONTEXT_MAX) {
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switch (ip) {
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case PERF_CONTEXT_HV:
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cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
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case PERF_CONTEXT_KERNEL:
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cpumode = PERF_RECORD_MISC_KERNEL; break;
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case PERF_CONTEXT_USER:
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cpumode = PERF_RECORD_MISC_USER; break;
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default:
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break;
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}
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continue;
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}
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al.filtered = false;
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thread__find_addr_location(thread, self, cpumode,
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MAP__FUNCTION, thread->pid, ip, &al, NULL);
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if (al.sym != NULL) {
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if (sort__has_parent && !*parent &&
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symbol__match_parent_regex(al.sym))
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*parent = al.sym;
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if (!symbol_conf.use_callchain)
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break;
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}
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err = callchain_cursor_append(&self->callchain_cursor,
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ip, al.map, al.sym);
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if (err)
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return err;
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}
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return 0;
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}
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static int process_event_synth_stub(union perf_event *event __used,
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struct perf_session *session __used)
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{
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dump_printf(": unhandled!\n");
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return 0;
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}
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static int process_event_stub(union perf_event *event __used,
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struct perf_sample *sample __used,
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struct perf_session *session __used)
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{
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dump_printf(": unhandled!\n");
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return 0;
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}
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static int process_finished_round_stub(union perf_event *event __used,
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struct perf_session *session __used,
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struct perf_event_ops *ops __used)
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{
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dump_printf(": unhandled!\n");
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return 0;
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}
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static int process_finished_round(union perf_event *event,
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struct perf_session *session,
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struct perf_event_ops *ops);
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static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
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{
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if (handler->sample == NULL)
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handler->sample = process_event_stub;
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if (handler->mmap == NULL)
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handler->mmap = process_event_stub;
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if (handler->comm == NULL)
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handler->comm = process_event_stub;
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if (handler->fork == NULL)
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handler->fork = process_event_stub;
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if (handler->exit == NULL)
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handler->exit = process_event_stub;
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if (handler->lost == NULL)
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handler->lost = perf_event__process_lost;
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if (handler->read == NULL)
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handler->read = process_event_stub;
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if (handler->throttle == NULL)
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handler->throttle = process_event_stub;
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if (handler->unthrottle == NULL)
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handler->unthrottle = process_event_stub;
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if (handler->attr == NULL)
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handler->attr = process_event_synth_stub;
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if (handler->event_type == NULL)
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handler->event_type = process_event_synth_stub;
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if (handler->tracing_data == NULL)
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handler->tracing_data = process_event_synth_stub;
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if (handler->build_id == NULL)
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handler->build_id = process_event_synth_stub;
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if (handler->finished_round == NULL) {
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if (handler->ordered_samples)
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handler->finished_round = process_finished_round;
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else
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handler->finished_round = process_finished_round_stub;
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}
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}
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void mem_bswap_64(void *src, int byte_size)
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{
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u64 *m = src;
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while (byte_size > 0) {
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*m = bswap_64(*m);
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byte_size -= sizeof(u64);
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++m;
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}
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}
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static void perf_event__all64_swap(union perf_event *event)
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{
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struct perf_event_header *hdr = &event->header;
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mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
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}
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static void perf_event__comm_swap(union perf_event *event)
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{
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event->comm.pid = bswap_32(event->comm.pid);
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event->comm.tid = bswap_32(event->comm.tid);
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}
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static void perf_event__mmap_swap(union perf_event *event)
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{
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event->mmap.pid = bswap_32(event->mmap.pid);
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event->mmap.tid = bswap_32(event->mmap.tid);
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event->mmap.start = bswap_64(event->mmap.start);
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event->mmap.len = bswap_64(event->mmap.len);
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event->mmap.pgoff = bswap_64(event->mmap.pgoff);
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}
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static void perf_event__task_swap(union perf_event *event)
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{
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event->fork.pid = bswap_32(event->fork.pid);
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event->fork.tid = bswap_32(event->fork.tid);
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event->fork.ppid = bswap_32(event->fork.ppid);
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event->fork.ptid = bswap_32(event->fork.ptid);
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event->fork.time = bswap_64(event->fork.time);
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}
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static void perf_event__read_swap(union perf_event *event)
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{
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event->read.pid = bswap_32(event->read.pid);
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event->read.tid = bswap_32(event->read.tid);
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event->read.value = bswap_64(event->read.value);
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event->read.time_enabled = bswap_64(event->read.time_enabled);
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event->read.time_running = bswap_64(event->read.time_running);
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event->read.id = bswap_64(event->read.id);
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}
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static void perf_event__attr_swap(union perf_event *event)
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{
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size_t size;
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event->attr.attr.type = bswap_32(event->attr.attr.type);
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event->attr.attr.size = bswap_32(event->attr.attr.size);
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event->attr.attr.config = bswap_64(event->attr.attr.config);
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event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period);
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event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type);
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event->attr.attr.read_format = bswap_64(event->attr.attr.read_format);
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event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events);
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event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type);
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event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr);
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event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len);
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size = event->header.size;
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size -= (void *)&event->attr.id - (void *)event;
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mem_bswap_64(event->attr.id, size);
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}
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static void perf_event__event_type_swap(union perf_event *event)
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{
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event->event_type.event_type.event_id =
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bswap_64(event->event_type.event_type.event_id);
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}
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static void perf_event__tracing_data_swap(union perf_event *event)
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{
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event->tracing_data.size = bswap_32(event->tracing_data.size);
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}
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typedef void (*perf_event__swap_op)(union perf_event *event);
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static perf_event__swap_op perf_event__swap_ops[] = {
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[PERF_RECORD_MMAP] = perf_event__mmap_swap,
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[PERF_RECORD_COMM] = perf_event__comm_swap,
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[PERF_RECORD_FORK] = perf_event__task_swap,
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[PERF_RECORD_EXIT] = perf_event__task_swap,
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[PERF_RECORD_LOST] = perf_event__all64_swap,
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[PERF_RECORD_READ] = perf_event__read_swap,
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[PERF_RECORD_SAMPLE] = perf_event__all64_swap,
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[PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap,
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[PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
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[PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
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[PERF_RECORD_HEADER_BUILD_ID] = NULL,
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[PERF_RECORD_HEADER_MAX] = NULL,
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};
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struct sample_queue {
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u64 timestamp;
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u64 file_offset;
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union perf_event *event;
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struct list_head list;
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};
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static void perf_session_free_sample_buffers(struct perf_session *session)
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{
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struct ordered_samples *os = &session->ordered_samples;
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while (!list_empty(&os->to_free)) {
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struct sample_queue *sq;
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sq = list_entry(os->to_free.next, struct sample_queue, list);
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list_del(&sq->list);
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free(sq);
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}
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}
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static int perf_session_deliver_event(struct perf_session *session,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_event_ops *ops,
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u64 file_offset);
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static void flush_sample_queue(struct perf_session *s,
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struct perf_event_ops *ops)
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{
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struct ordered_samples *os = &s->ordered_samples;
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struct list_head *head = &os->samples;
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struct sample_queue *tmp, *iter;
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struct perf_sample sample;
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u64 limit = os->next_flush;
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u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
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if (!ops->ordered_samples || !limit)
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return;
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list_for_each_entry_safe(iter, tmp, head, list) {
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if (iter->timestamp > limit)
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break;
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perf_session__parse_sample(s, iter->event, &sample);
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perf_session_deliver_event(s, iter->event, &sample, ops,
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iter->file_offset);
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os->last_flush = iter->timestamp;
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list_del(&iter->list);
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list_add(&iter->list, &os->sample_cache);
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|
}
|
|
|
|
if (list_empty(head)) {
|
|
os->last_sample = NULL;
|
|
} else if (last_ts <= limit) {
|
|
os->last_sample =
|
|
list_entry(head->prev, struct sample_queue, list);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* When perf record finishes a pass on every buffers, it records this pseudo
|
|
* event.
|
|
* We record the max timestamp t found in the pass n.
|
|
* Assuming these timestamps are monotonic across cpus, we know that if
|
|
* a buffer still has events with timestamps below t, they will be all
|
|
* available and then read in the pass n + 1.
|
|
* Hence when we start to read the pass n + 2, we can safely flush every
|
|
* events with timestamps below t.
|
|
*
|
|
* ============ PASS n =================
|
|
* CPU 0 | CPU 1
|
|
* |
|
|
* cnt1 timestamps | cnt2 timestamps
|
|
* 1 | 2
|
|
* 2 | 3
|
|
* - | 4 <--- max recorded
|
|
*
|
|
* ============ PASS n + 1 ==============
|
|
* CPU 0 | CPU 1
|
|
* |
|
|
* cnt1 timestamps | cnt2 timestamps
|
|
* 3 | 5
|
|
* 4 | 6
|
|
* 5 | 7 <---- max recorded
|
|
*
|
|
* Flush every events below timestamp 4
|
|
*
|
|
* ============ PASS n + 2 ==============
|
|
* CPU 0 | CPU 1
|
|
* |
|
|
* cnt1 timestamps | cnt2 timestamps
|
|
* 6 | 8
|
|
* 7 | 9
|
|
* - | 10
|
|
*
|
|
* Flush every events below timestamp 7
|
|
* etc...
|
|
*/
|
|
static int process_finished_round(union perf_event *event __used,
|
|
struct perf_session *session,
|
|
struct perf_event_ops *ops)
|
|
{
|
|
flush_sample_queue(session, ops);
|
|
session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* The queue is ordered by time */
|
|
static void __queue_event(struct sample_queue *new, struct perf_session *s)
|
|
{
|
|
struct ordered_samples *os = &s->ordered_samples;
|
|
struct sample_queue *sample = os->last_sample;
|
|
u64 timestamp = new->timestamp;
|
|
struct list_head *p;
|
|
|
|
os->last_sample = new;
|
|
|
|
if (!sample) {
|
|
list_add(&new->list, &os->samples);
|
|
os->max_timestamp = timestamp;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* last_sample might point to some random place in the list as it's
|
|
* the last queued event. We expect that the new event is close to
|
|
* this.
|
|
*/
|
|
if (sample->timestamp <= timestamp) {
|
|
while (sample->timestamp <= timestamp) {
|
|
p = sample->list.next;
|
|
if (p == &os->samples) {
|
|
list_add_tail(&new->list, &os->samples);
|
|
os->max_timestamp = timestamp;
|
|
return;
|
|
}
|
|
sample = list_entry(p, struct sample_queue, list);
|
|
}
|
|
list_add_tail(&new->list, &sample->list);
|
|
} else {
|
|
while (sample->timestamp > timestamp) {
|
|
p = sample->list.prev;
|
|
if (p == &os->samples) {
|
|
list_add(&new->list, &os->samples);
|
|
return;
|
|
}
|
|
sample = list_entry(p, struct sample_queue, list);
|
|
}
|
|
list_add(&new->list, &sample->list);
|
|
}
|
|
}
|
|
|
|
#define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
|
|
|
|
static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
|
|
struct perf_sample *sample, u64 file_offset)
|
|
{
|
|
struct ordered_samples *os = &s->ordered_samples;
|
|
struct list_head *sc = &os->sample_cache;
|
|
u64 timestamp = sample->time;
|
|
struct sample_queue *new;
|
|
|
|
if (!timestamp || timestamp == ~0ULL)
|
|
return -ETIME;
|
|
|
|
if (timestamp < s->ordered_samples.last_flush) {
|
|
printf("Warning: Timestamp below last timeslice flush\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!list_empty(sc)) {
|
|
new = list_entry(sc->next, struct sample_queue, list);
|
|
list_del(&new->list);
|
|
} else if (os->sample_buffer) {
|
|
new = os->sample_buffer + os->sample_buffer_idx;
|
|
if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
|
|
os->sample_buffer = NULL;
|
|
} else {
|
|
os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
|
|
if (!os->sample_buffer)
|
|
return -ENOMEM;
|
|
list_add(&os->sample_buffer->list, &os->to_free);
|
|
os->sample_buffer_idx = 2;
|
|
new = os->sample_buffer + 1;
|
|
}
|
|
|
|
new->timestamp = timestamp;
|
|
new->file_offset = file_offset;
|
|
new->event = event;
|
|
|
|
__queue_event(new, s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void callchain__printf(struct perf_sample *sample)
|
|
{
|
|
unsigned int i;
|
|
|
|
printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
|
|
|
|
for (i = 0; i < sample->callchain->nr; i++)
|
|
printf("..... %2d: %016" PRIx64 "\n",
|
|
i, sample->callchain->ips[i]);
|
|
}
|
|
|
|
static void perf_session__print_tstamp(struct perf_session *session,
|
|
union perf_event *event,
|
|
struct perf_sample *sample)
|
|
{
|
|
if (event->header.type != PERF_RECORD_SAMPLE &&
|
|
!session->sample_id_all) {
|
|
fputs("-1 -1 ", stdout);
|
|
return;
|
|
}
|
|
|
|
if ((session->sample_type & PERF_SAMPLE_CPU))
|
|
printf("%u ", sample->cpu);
|
|
|
|
if (session->sample_type & PERF_SAMPLE_TIME)
|
|
printf("%" PRIu64 " ", sample->time);
|
|
}
|
|
|
|
static void dump_event(struct perf_session *session, union perf_event *event,
|
|
u64 file_offset, struct perf_sample *sample)
|
|
{
|
|
if (!dump_trace)
|
|
return;
|
|
|
|
printf("\n%#" PRIx64 " [%#x]: event: %d\n",
|
|
file_offset, event->header.size, event->header.type);
|
|
|
|
trace_event(event);
|
|
|
|
if (sample)
|
|
perf_session__print_tstamp(session, event, sample);
|
|
|
|
printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
|
|
event->header.size, perf_event__name(event->header.type));
|
|
}
|
|
|
|
static void dump_sample(struct perf_session *session, union perf_event *event,
|
|
struct perf_sample *sample)
|
|
{
|
|
if (!dump_trace)
|
|
return;
|
|
|
|
printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n",
|
|
event->header.misc, sample->pid, sample->tid, sample->ip,
|
|
sample->period);
|
|
|
|
if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
|
|
callchain__printf(sample);
|
|
}
|
|
|
|
static int perf_session_deliver_event(struct perf_session *session,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct perf_event_ops *ops,
|
|
u64 file_offset)
|
|
{
|
|
dump_event(session, event, file_offset, sample);
|
|
|
|
switch (event->header.type) {
|
|
case PERF_RECORD_SAMPLE:
|
|
dump_sample(session, event, sample);
|
|
return ops->sample(event, sample, session);
|
|
case PERF_RECORD_MMAP:
|
|
return ops->mmap(event, sample, session);
|
|
case PERF_RECORD_COMM:
|
|
return ops->comm(event, sample, session);
|
|
case PERF_RECORD_FORK:
|
|
return ops->fork(event, sample, session);
|
|
case PERF_RECORD_EXIT:
|
|
return ops->exit(event, sample, session);
|
|
case PERF_RECORD_LOST:
|
|
return ops->lost(event, sample, session);
|
|
case PERF_RECORD_READ:
|
|
return ops->read(event, sample, session);
|
|
case PERF_RECORD_THROTTLE:
|
|
return ops->throttle(event, sample, session);
|
|
case PERF_RECORD_UNTHROTTLE:
|
|
return ops->unthrottle(event, sample, session);
|
|
default:
|
|
++session->hists.stats.nr_unknown_events;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int perf_session__preprocess_sample(struct perf_session *session,
|
|
union perf_event *event, struct perf_sample *sample)
|
|
{
|
|
if (event->header.type != PERF_RECORD_SAMPLE ||
|
|
!(session->sample_type & PERF_SAMPLE_CALLCHAIN))
|
|
return 0;
|
|
|
|
if (!ip_callchain__valid(sample->callchain, event)) {
|
|
pr_debug("call-chain problem with event, skipping it.\n");
|
|
++session->hists.stats.nr_invalid_chains;
|
|
session->hists.stats.total_invalid_chains += sample->period;
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
|
|
struct perf_event_ops *ops, u64 file_offset)
|
|
{
|
|
dump_event(session, event, file_offset, NULL);
|
|
|
|
/* These events are processed right away */
|
|
switch (event->header.type) {
|
|
case PERF_RECORD_HEADER_ATTR:
|
|
return ops->attr(event, session);
|
|
case PERF_RECORD_HEADER_EVENT_TYPE:
|
|
return ops->event_type(event, session);
|
|
case PERF_RECORD_HEADER_TRACING_DATA:
|
|
/* setup for reading amidst mmap */
|
|
lseek(session->fd, file_offset, SEEK_SET);
|
|
return ops->tracing_data(event, session);
|
|
case PERF_RECORD_HEADER_BUILD_ID:
|
|
return ops->build_id(event, session);
|
|
case PERF_RECORD_FINISHED_ROUND:
|
|
return ops->finished_round(event, session, ops);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int perf_session__process_event(struct perf_session *session,
|
|
union perf_event *event,
|
|
struct perf_event_ops *ops,
|
|
u64 file_offset)
|
|
{
|
|
struct perf_sample sample;
|
|
int ret;
|
|
|
|
if (session->header.needs_swap &&
|
|
perf_event__swap_ops[event->header.type])
|
|
perf_event__swap_ops[event->header.type](event);
|
|
|
|
if (event->header.type >= PERF_RECORD_HEADER_MAX)
|
|
return -EINVAL;
|
|
|
|
hists__inc_nr_events(&session->hists, event->header.type);
|
|
|
|
if (event->header.type >= PERF_RECORD_USER_TYPE_START)
|
|
return perf_session__process_user_event(session, event, ops, file_offset);
|
|
|
|
/*
|
|
* For all kernel events we get the sample data
|
|
*/
|
|
perf_session__parse_sample(session, event, &sample);
|
|
|
|
/* Preprocess sample records - precheck callchains */
|
|
if (perf_session__preprocess_sample(session, event, &sample))
|
|
return 0;
|
|
|
|
if (ops->ordered_samples) {
|
|
ret = perf_session_queue_event(session, event, &sample,
|
|
file_offset);
|
|
if (ret != -ETIME)
|
|
return ret;
|
|
}
|
|
|
|
return perf_session_deliver_event(session, event, &sample, ops,
|
|
file_offset);
|
|
}
|
|
|
|
void perf_event_header__bswap(struct perf_event_header *self)
|
|
{
|
|
self->type = bswap_32(self->type);
|
|
self->misc = bswap_16(self->misc);
|
|
self->size = bswap_16(self->size);
|
|
}
|
|
|
|
static struct thread *perf_session__register_idle_thread(struct perf_session *self)
|
|
{
|
|
struct thread *thread = perf_session__findnew(self, 0);
|
|
|
|
if (thread == NULL || thread__set_comm(thread, "swapper")) {
|
|
pr_err("problem inserting idle task.\n");
|
|
thread = NULL;
|
|
}
|
|
|
|
return thread;
|
|
}
|
|
|
|
static void perf_session__warn_about_errors(const struct perf_session *session,
|
|
const struct perf_event_ops *ops)
|
|
{
|
|
if (ops->lost == perf_event__process_lost &&
|
|
session->hists.stats.total_lost != 0) {
|
|
ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
|
|
"!\n\nCheck IO/CPU overload!\n\n",
|
|
session->hists.stats.total_period,
|
|
session->hists.stats.total_lost);
|
|
}
|
|
|
|
if (session->hists.stats.nr_unknown_events != 0) {
|
|
ui__warning("Found %u unknown events!\n\n"
|
|
"Is this an older tool processing a perf.data "
|
|
"file generated by a more recent tool?\n\n"
|
|
"If that is not the case, consider "
|
|
"reporting to linux-kernel@vger.kernel.org.\n\n",
|
|
session->hists.stats.nr_unknown_events);
|
|
}
|
|
|
|
if (session->hists.stats.nr_invalid_chains != 0) {
|
|
ui__warning("Found invalid callchains!\n\n"
|
|
"%u out of %u events were discarded for this reason.\n\n"
|
|
"Consider reporting to linux-kernel@vger.kernel.org.\n\n",
|
|
session->hists.stats.nr_invalid_chains,
|
|
session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
|
|
}
|
|
}
|
|
|
|
#define session_done() (*(volatile int *)(&session_done))
|
|
volatile int session_done;
|
|
|
|
static int __perf_session__process_pipe_events(struct perf_session *self,
|
|
struct perf_event_ops *ops)
|
|
{
|
|
union perf_event event;
|
|
uint32_t size;
|
|
int skip = 0;
|
|
u64 head;
|
|
int err;
|
|
void *p;
|
|
|
|
perf_event_ops__fill_defaults(ops);
|
|
|
|
head = 0;
|
|
more:
|
|
err = readn(self->fd, &event, sizeof(struct perf_event_header));
|
|
if (err <= 0) {
|
|
if (err == 0)
|
|
goto done;
|
|
|
|
pr_err("failed to read event header\n");
|
|
goto out_err;
|
|
}
|
|
|
|
if (self->header.needs_swap)
|
|
perf_event_header__bswap(&event.header);
|
|
|
|
size = event.header.size;
|
|
if (size == 0)
|
|
size = 8;
|
|
|
|
p = &event;
|
|
p += sizeof(struct perf_event_header);
|
|
|
|
if (size - sizeof(struct perf_event_header)) {
|
|
err = readn(self->fd, p, size - sizeof(struct perf_event_header));
|
|
if (err <= 0) {
|
|
if (err == 0) {
|
|
pr_err("unexpected end of event stream\n");
|
|
goto done;
|
|
}
|
|
|
|
pr_err("failed to read event data\n");
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (size == 0 ||
|
|
(skip = perf_session__process_event(self, &event, ops, head)) < 0) {
|
|
dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
|
|
head, event.header.size, event.header.type);
|
|
/*
|
|
* assume we lost track of the stream, check alignment, and
|
|
* increment a single u64 in the hope to catch on again 'soon'.
|
|
*/
|
|
if (unlikely(head & 7))
|
|
head &= ~7ULL;
|
|
|
|
size = 8;
|
|
}
|
|
|
|
head += size;
|
|
|
|
if (skip > 0)
|
|
head += skip;
|
|
|
|
if (!session_done())
|
|
goto more;
|
|
done:
|
|
err = 0;
|
|
out_err:
|
|
perf_session__warn_about_errors(self, ops);
|
|
perf_session_free_sample_buffers(self);
|
|
return err;
|
|
}
|
|
|
|
int __perf_session__process_events(struct perf_session *session,
|
|
u64 data_offset, u64 data_size,
|
|
u64 file_size, struct perf_event_ops *ops)
|
|
{
|
|
u64 head, page_offset, file_offset, file_pos, progress_next;
|
|
int err, mmap_prot, mmap_flags, map_idx = 0;
|
|
struct ui_progress *progress;
|
|
size_t page_size, mmap_size;
|
|
char *buf, *mmaps[8];
|
|
union perf_event *event;
|
|
uint32_t size;
|
|
|
|
perf_event_ops__fill_defaults(ops);
|
|
|
|
page_size = sysconf(_SC_PAGESIZE);
|
|
|
|
page_offset = page_size * (data_offset / page_size);
|
|
file_offset = page_offset;
|
|
head = data_offset - page_offset;
|
|
|
|
if (data_offset + data_size < file_size)
|
|
file_size = data_offset + data_size;
|
|
|
|
progress_next = file_size / 16;
|
|
progress = ui_progress__new("Processing events...", file_size);
|
|
if (progress == NULL)
|
|
return -1;
|
|
|
|
mmap_size = session->mmap_window;
|
|
if (mmap_size > file_size)
|
|
mmap_size = file_size;
|
|
|
|
memset(mmaps, 0, sizeof(mmaps));
|
|
|
|
mmap_prot = PROT_READ;
|
|
mmap_flags = MAP_SHARED;
|
|
|
|
if (session->header.needs_swap) {
|
|
mmap_prot |= PROT_WRITE;
|
|
mmap_flags = MAP_PRIVATE;
|
|
}
|
|
remap:
|
|
buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
|
|
file_offset);
|
|
if (buf == MAP_FAILED) {
|
|
pr_err("failed to mmap file\n");
|
|
err = -errno;
|
|
goto out_err;
|
|
}
|
|
mmaps[map_idx] = buf;
|
|
map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
|
|
file_pos = file_offset + head;
|
|
|
|
more:
|
|
event = (union perf_event *)(buf + head);
|
|
|
|
if (session->header.needs_swap)
|
|
perf_event_header__bswap(&event->header);
|
|
size = event->header.size;
|
|
if (size == 0)
|
|
size = 8;
|
|
|
|
if (head + event->header.size > mmap_size) {
|
|
if (mmaps[map_idx]) {
|
|
munmap(mmaps[map_idx], mmap_size);
|
|
mmaps[map_idx] = NULL;
|
|
}
|
|
|
|
page_offset = page_size * (head / page_size);
|
|
file_offset += page_offset;
|
|
head -= page_offset;
|
|
goto remap;
|
|
}
|
|
|
|
size = event->header.size;
|
|
|
|
if (size == 0 ||
|
|
perf_session__process_event(session, event, ops, file_pos) < 0) {
|
|
dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
|
|
file_offset + head, event->header.size,
|
|
event->header.type);
|
|
/*
|
|
* assume we lost track of the stream, check alignment, and
|
|
* increment a single u64 in the hope to catch on again 'soon'.
|
|
*/
|
|
if (unlikely(head & 7))
|
|
head &= ~7ULL;
|
|
|
|
size = 8;
|
|
}
|
|
|
|
head += size;
|
|
file_pos += size;
|
|
|
|
if (file_pos >= progress_next) {
|
|
progress_next += file_size / 16;
|
|
ui_progress__update(progress, file_pos);
|
|
}
|
|
|
|
if (file_pos < file_size)
|
|
goto more;
|
|
|
|
err = 0;
|
|
/* do the final flush for ordered samples */
|
|
session->ordered_samples.next_flush = ULLONG_MAX;
|
|
flush_sample_queue(session, ops);
|
|
out_err:
|
|
ui_progress__delete(progress);
|
|
perf_session__warn_about_errors(session, ops);
|
|
perf_session_free_sample_buffers(session);
|
|
return err;
|
|
}
|
|
|
|
int perf_session__process_events(struct perf_session *self,
|
|
struct perf_event_ops *ops)
|
|
{
|
|
int err;
|
|
|
|
if (perf_session__register_idle_thread(self) == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (!self->fd_pipe)
|
|
err = __perf_session__process_events(self,
|
|
self->header.data_offset,
|
|
self->header.data_size,
|
|
self->size, ops);
|
|
else
|
|
err = __perf_session__process_pipe_events(self, ops);
|
|
|
|
return err;
|
|
}
|
|
|
|
bool perf_session__has_traces(struct perf_session *self, const char *msg)
|
|
{
|
|
if (!(self->sample_type & PERF_SAMPLE_RAW)) {
|
|
pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
|
|
const char *symbol_name,
|
|
u64 addr)
|
|
{
|
|
char *bracket;
|
|
enum map_type i;
|
|
struct ref_reloc_sym *ref;
|
|
|
|
ref = zalloc(sizeof(struct ref_reloc_sym));
|
|
if (ref == NULL)
|
|
return -ENOMEM;
|
|
|
|
ref->name = strdup(symbol_name);
|
|
if (ref->name == NULL) {
|
|
free(ref);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bracket = strchr(ref->name, ']');
|
|
if (bracket)
|
|
*bracket = '\0';
|
|
|
|
ref->addr = addr;
|
|
|
|
for (i = 0; i < MAP__NR_TYPES; ++i) {
|
|
struct kmap *kmap = map__kmap(maps[i]);
|
|
kmap->ref_reloc_sym = ref;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
|
|
{
|
|
return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
|
|
__dsos__fprintf(&self->host_machine.user_dsos, fp) +
|
|
machines__fprintf_dsos(&self->machines, fp);
|
|
}
|
|
|
|
size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
|
|
bool with_hits)
|
|
{
|
|
size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
|
|
return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
|
|
}
|
|
|
|
size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
|
|
{
|
|
struct perf_evsel *pos;
|
|
size_t ret = fprintf(fp, "Aggregated stats:\n");
|
|
|
|
ret += hists__fprintf_nr_events(&session->hists, fp);
|
|
|
|
list_for_each_entry(pos, &session->evlist->entries, node) {
|
|
ret += fprintf(fp, "%s stats:\n", event_name(pos));
|
|
ret += hists__fprintf_nr_events(&pos->hists, fp);
|
|
}
|
|
|
|
return ret;
|
|
}
|